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Accumulated Other Comprehensive Income (Loss), Net of Tax (Reclassifications of AOCI) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | $ 15 | $ (19) | $ 33 | $ (44) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax | (8) | 9 | (17) | 20 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 7 | (10) | 16 | (24) |
Cash Flow Hedges [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 0 | 0 | 0 | $ 0
Pension and OPEB Plans [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification Adjustment from AOCI, Pension and OPEB, Pre-Tax | (10) | (14) | (20) | (28) |
Reclassification Adjustment from AOCI, Pension and OPEB, Tax | 4 | 6 | 8 | 12 |
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax | (6) | (8) | (12) | (16) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (6) | (8) | (12) | (16) |
Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | 25 | (5) | 53 | (16) |
Reclassification for Available for Sale Securities, Tax | (12) | 3 | (25) | 8 |
Reclassification for Available for Sale Securities, After-Tax | 13 | (2) | 28 | (8) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 13 | (2) | 28 | (8) |
Power [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 16 | (18) | 26 | (41) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax | (9) | 8 | (15) | 18 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 7 | (10) | 11 | (23) |
Power [Member] | Cash Flow Hedges [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 0 | 0 | 0 |
Power [Member] | Pension and OPEB Plans [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification Adjustment from AOCI, Pension and OPEB, Pre-Tax | (8) | (12) | (17) | (24) |
Reclassification Adjustment from AOCI, Pension and OPEB, Tax | 3 | 5 | 7 | 10 |
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax | (5) | (7) | (10) | (14) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (5) | (7) | (10) | (14) |
Power [Member] | Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | 24 | (6) | 43 | (17) |
Reclassification for Available for Sale Securities, Tax | (12) | 3 | (22) | 8 |
Reclassification for Available for Sale Securities, After-Tax | 12 | (3) | 21 | (9) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 12 | (3) | 21 | (9) |
Operating Expense [Member] | Pension and OPEB Plans [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Amortization of Prior Service (Cost) Credit, Pre-Tax | 2 | 3 | 4 | 6 |
Amortization of Prior Service (Cost) Credit, Tax | (1) | (1) | (2) | (2) |
Amortization of Prior Service (Cost) Credit, After-Tax | 1 | 2 | 2 | 4 |
Amortization of Actuarial Loss, Pre-Tax | (12) | (17) | (24) | (34) |
Amortization of Actuarial Loss, Tax | 5 | 7 | 10 | 14 |
Amortization of Actuarial Loss, After-Tax | (7) | (10) | (14) | (20) |
Operating Expense [Member] | Power [Member] | Pension and OPEB Plans [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Amortization of Prior Service (Cost) Credit, Pre-Tax | 2 | 2 | 4 | 5 |
Amortization of Prior Service (Cost) Credit, Tax | (1) | (1) | (2) | (2) |
Amortization of Prior Service (Cost) Credit, After-Tax | 1 | 1 | 2 | 3 |
Amortization of Actuarial Loss, Pre-Tax | (10) | (14) | (21) | (29) |
Amortization of Actuarial Loss, Tax | 4 | 6 | 9 | 12 |
Amortization of Actuarial Loss, After-Tax | (6) | (8) | (12) | (17) |
Other Income [Member] | Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | 34 | 12 | 70 | 28 |
Reclassification for Available for Sale Securities, Tax | (17) | (6) | (34) | (14) |
Reclassification for Available for Sale Securities, After-Tax | 17 | 6 | 36 | 14 |
Other Income [Member] | Power [Member] | Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | 32 | 10 | 57 | 25 |
Reclassification for Available for Sale Securities, Tax | (16) | (5) | (29) | (13) |
Reclassification for Available for Sale Securities, After-Tax | 16 | 5 | 28 | 12 |
Other Expense [Member] | Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | (6) | (7) | (13) | (24) |
Reclassification for Available for Sale Securities, Tax | 4 | 4 | 7 | 12 |
Reclassification for Available for Sale Securities, After-Tax | (2) | (3) | (6) | (12) |
Other Expense [Member] | Power [Member] | Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | (5) | (6) | (10) | (22) |
Reclassification for Available for Sale Securities, Tax | 3 | 3 | 5 | 11 |
Reclassification for Available for Sale Securities, After-Tax | (2) | (3) | (5) | (11) |
Other-Than-Temporary Impairments [Member] | Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | (3) | (10) | (4) | (20) |
Reclassification for Available for Sale Securities, Tax | 1 | 5 | 2 | 10 |
Reclassification for Available for Sale Securities, After-Tax | (2) | (5) | (2) | (10) |
Other-Than-Temporary Impairments [Member] | Power [Member] | Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | (3) | (10) | (4) | (20) |
Reclassification for Available for Sale Securities, Tax | 1 | 5 | 2 | 10 |
Reclassification for Available for Sale Securities, After-Tax | $ (2) | $ (5) | $ (2) | $ (10) |

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